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    <title>Document</title>
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    <div id="app">
        撒旦法
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    #app{
        /* 设置轮廓属性  设置一系列*/
        outline: double;
        /* 设置轮廓的颜色 */
        outline-color:aqua ;
        /* 设置轮廓的样式 */
        outline-style:dotted ;
        /* 设置轮廓的宽度 */
        outline-width: 2px;
    }

</style>

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